My mom started making these for my uncle when he went away to college. Approximately 40 years later, she still makes them every year for his birthday.
2 tbsp butter
1 c brown sugar
1 c pecans, chopped
5-6 tbsp flour
1/8 tsp baking soda
1 tsp vanilla
Preheat oven to 350 degrees. Melt butter in 9x9 (13x9 if doubling) baking pan (in oven while preheating -- 2-3 minutes). Mix brown sugar, pecans, flour, and baking soda in bowl.
Beat eggs. Add brown sugar mixture and vanilla to eggs and stir to mix. Pour in the center of the baking pan. Do not stir.
Bake at 350 degrees for 20-25 minutes.
Sprinkle powdered sugar on top using a strainer.